RDC Adapter - 3/4" Long - From F71 Bipin to F73 RDC (25) RDC Adapter (Recessed Double Contact) Makes an F71 BP Lamp Fit an F73 Socket Reusable RDC Cap - durable plastic with metal contacts Adapters are quick to install, just insert over the bipins on your lamp. Fast same day shipping - Can not ship to Alaska or Hawaii